Hello,
Thank you for posting in Microsoft Community forum.
Based on the description, I understand your question is related to StartMenuExperienceHost crashes.
The error code 0xC0000409 (STATUS_STACK_BUFFER_OVERRUN) indicates a stack buffer overflow, which can occur when a program writes more data to a buffer than it can hold.
If the problem is specific to one user profile, it might be due to corruption in that profile.
Create a new user profile and see if the issue persists there.
Also, check what changes are made before this issue happen, if possible try revert back the changes.
Try install latest windows cumulative updates and driver update, then monitor this issue.
Have a nice day.
Best Regards,
Molly